It is mandatory for USBL systems to be calibrated with an INS/AHRS on board of a vessel
to give accurate position and attitude to the USBL system. Calibration is not necessary with
Gaps M7 because it contains an INS inside of the USBL head. The calibration is done during
the manufacture process, making Gaps M7 a precalibrated system. No calibration is nec-
essary by the end user and Gaps M7 can be installed and be operational in less than an
hour.
Gaps M5 does not need to be calibrated, even after a hydrophone replacement.
Gaps systems mixes USBL, INS and GPS technologies to give the most accurate USBL
data in its category, it operates in deep or very shallow water and difficult environments
where other systems are deficient. As Gaps has an integrated INS, this allows its use with-
out a calibration. Where it is necessary to carefully calibrate all other USBL systems with
the INS on board, it is not necessary to carry out this calibration for Gaps, as it is pre-
calibrated at our factory with Phins/Octans inside. This will save a lot of time for users and
Gaps can be operational in less than an hour. The important point to know is that it is nec-
essary to align Gaps to obtain the best accuracy. This means that it is necessary that the
vessel stay with a constant heading during 5 minutes for the coarse alignment, then it is
necessary that it move in different directions for 25 minutes for the fine alignment. In only
30 minutes, Gaps will be ready to deliver you the specified accuracy.
By default the IP address is indicated on the Gaps BOX sticker and is 192.168.36.1XX, with
XX being the last two numbers of the serial number. If the IP address has been changed
and is not known, the following steps can be taken. If you have changed the address and
lost it, you can retrieve this IP address as follows: Connect a hyperterminal on the PC to
one of the RS232 sockets. Configure the terminal to the following settings: baudrate 115200
bds, data bits 8, parity: none, stop bits: 1. Reboot the unit by switching it off and on, the IP
address will be broadcasted by Gaps on the hyperterminal.
Summary of Contents for Gaps M5
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